package com.example.blog.utils;

import com.example.blog.constants.Constants;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;

import java.security.Key;
import java.util.Date;
import java.util.Map;
@Slf4j
public class JwtUtils {
    private static final long JWT_EXPIRTION = 60*60*1000;
    private static final String secretStr = "XxmY0y9GL7mKR+k0EN2oNS/v1pzkgbXU6OnBCtFi27I=";
    private static final Key key = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretStr));

    public static String genJwtToken(Map<String,Object> claim){
        String token = Jwts.builder().setClaims(claim)
                .setExpiration(new  Date(System.currentTimeMillis()+ JWT_EXPIRTION ))
                .signWith(key)
                .compact();
        return token;


    }


    /*
    校验token
    * */
    public static Claims parseToken(String token){
        JwtParser build = Jwts.parserBuilder().setSigningKey(key).build();
        Claims claims =null;
        try {
            claims = build.parseClaimsJws(token).getBody();
            log.info("解析token__:{}",claims);


        }catch (Exception e){
            log.error("解析token失败:{}",token);
            return null;

        }
        return claims;


    }

    public  static Integer getIdByToken(String token){
        Claims claims = parseToken(token);
        if(claims!=null){
            Integer userId =(Integer) claims.get(Constants.TOKEN_ID);
            if(userId>0){
                return userId;
            }
        }
        return  null;


    }

}
